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About the principle of LNG storage tank isolation-2

By Manager
Date: Nov 18, 2019
Regarding the isolation principle of LNG storage tanks, we continue to talk about the plastic deformation of the damping device or the viscosity of the damping material to increase the damping of the structure and reduce the large displacement of the upper structure; The increase may also cause an increase in structural rigidity, so it is necessary to weigh the contradiction between damping and structural rigidity, and optimize the design as needed.
 
In order to achieve significant shock absorption, the isolation device must have the following four basic characteristics. Bearing characteristics: LNG tank isolation device has a large vertical bearing capacity. Under the condition of use, it can safely support all the weight and load of the superstructure, and has sufficient vertical bearing capacity to ensure the safety of the building structure. Safe and meet the requirements of use.
Seismic isolation characteristics: LNG cryogenic storage tank isolation device must have variable horizontal stiffness characteristics. Under strong wind and small earthquakes, the system has sufficient elastic stiffness K1, and the upper structure displacement is small without affecting the use requirements; When the horizontal stiffness K2 is small and the upper structure slides horizontally, the "rigid" seismic structural system becomes a "flexible" isolated structural system, and the natural vibration period is greatly extended, away from the natural vibration period of the upper structure, thereby The ground vibrations are effectively separated, which significantly reduces the seismic response of the superstructure. The acceleration response of the upper structure is 1/4~1/12 of the acceleration response of the traditional structure.

Damping energy consumption characteristics: From the load-displacement curve, the larger the envelope area of the curve, the smaller the displacement response of the upper structure.

Reset characteristics: The LNG cryogenic tank isolation device must have sufficient horizontal elastic restoring force to allow the superstructure to be automatically reset during an earthquake. After the earthquake has passed, the superstructure can return to the initial state to meet the normal use requirements.
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